Dump car.



PATENTED JULY .24, 1906.

S. OTIS. DUMP GAR. APPLICATION FILED APR. 20, 1906.

o O 0 Q 0 o o 2 i 3 o Q Q Q 6b a/ f1 Q o z 63 O o o I 3 i -@I j, G C C2 C1 81 M5566" I x I UNITED STATES PATENT OFFICE SPENCER OTIS,. OF CHICAGO, ILLINOIS. DUMP-CAR.

Specification of Letters Patent. 7

Patented July 24, 1906.

Application filed April 20. 1906. Serial No. 3l2 817.

,To all whom it may concern.-

Be it known that I, SPENCER Orrs,a citizen of the United States, residing at Chicago,

erating means for the dumping-doors where-- by'the doors are automatically closed after the load has beendischarged from them.

In the accompanying drawings, Figure 1 is a transverse section of a portion of a dumpcar, showing the dumping-door in closed po-' sition. Fig. 2 1s a view similar to Fig. 1, showing the dumping-door open. Fig. 3 is a sectional detail showing the valve.

In the drawings, 11 represents a dumping door hinged at a to or near the center sill of the car.

, c and a flexible connection 0 b is a rotatable shaft extending longitudinally of the car suitably mounted in the carframe. This shaft is connected by a crankarm 6 and a link or push arm I) to a transversely-moving bar b The bar b engages a track attached to the under side of the door,

which track comprises an inclined portion a and a horizontal portion a). When in closed position, the door engages the horizontal portion of thetrack a to hold the door closed. As the bar is withdrawn from horizontal portion by the rotation of the operating-shaft it travels on the inclined portion, permitting the door to open by the wei ht of the load thereon. These parts'are We 1 known in the art and are described merely for the purpose of a clear understanding of my invention. It will be understood that any other convenient means for operating the door may be substituted for them.

It is desirable in cars of this type to provide some means whereby the door may be closed automatically after the discharge of its load. For this purpose I have shown a ciylinder 0, having a piston (3 connected to t e rotatable operating-shaft by a piston-rod This cylinder may be conveniently mounted between the longitudinally-extending beams e e, forming a part of the center sill.

15 represents a reservoir for compressed air w 'ch may be supplied with compressed. air from any suitable source. This reservoir is connected by pipes f between which is mounted a valve f ,wit the operating-cylinmovement of the shaft, though I have not illustrate der 0. It will be readily understood that when air is admitted to the operating-cylinder through the pipes from the reservoir the iston will be caused to travel inthe cylin er, thereby rotating the operating-shaft and causing the door to close.

In order that the air may be admitted to the cylinder automatically at the proper time,

I provide the valve f (Shown in detail in Fig. 3.) This valve has passage-ways f f, connecting the pipes f f. Between these passage-ways is interposed a valve f normally seated so as to close communication between the pipesf f This valve is held to its seat by a spring f surrounding the valvestem f and interposed between the head f a on the end of the valve-stem and the valvecasing. A passage-way f 6 provides communication between the pipe f 2 and the atmosphere when the parts are in normal position.

The valve f is so arranged that the head f on the valve-stem is contacted by the end of .the crank-arm f 2 or the adjacent end of the push-bar b when the door reaches its lowermost point in opening. The valve will thus be raised from its seat and caused to rest in an upper seat f opening communication between the pipes f f 2 and closing communication between the pi e f 2 and the atmosphere. The valve will be eld in its upper position by the pressure of the air coming fromthe reservoir f, and the tension of the spring f 8 should be so adjusted that when the pressure in the cylinders is equalized the tension of the spring will be sufficient to pull the valve away from its upper seat to its lower seat, thus closing communication between the pipes f a f By this operation of the valve, as will'be readily understood, compressed air will be admitted from the reservoir f to the cylinder '0 when the door reaches its lowermost position. This will cause the iston c,

to move inwardly, thus rotating t e shaft and closing the door.

It will be understood that I have provided a dump-car with .a door-operatingmechanism which comprises an automatically-operated closing device which is tripped, and thus started in o eration by the opening dbor. The door is closed, therefore, automatically without further attention on the .part of the operator. It willbe understood of course, that-the car may be provided with the usual 'hand-operating devices'att'ached to the endoftheo cratingsuch devices, as they are commonly known and well 1 ment of the door for tripping the door-closing understood in this art. These hand-operat- 1 means.

ing devices may be used if for any reason the I 3. A dump-car having a bottom comprising a dumping-door, a rotatable shaft mountautomatie devices should fail to Work.

I claim' ed on the car-frame, connections between the 1.- A dump-car having a bottom provided shaft and the door whereby the door is operwith a dum ing-door, automatic means for ated by the shaft,- a cylinder having a piston closing the oor, and means operated by the flexibly connected to the shaft, and means olpening movement of the door for tripping operated by the door for admitting air under t e door-closing m'eans. pressure to. the cylinder for closing the door.

2. A dump-car having a bottom provided 5 SPENCER OTIS. with a dumping-door, means for opening the door, automatic means for closing the door, I and means operated by the opening move- I Witnesses:

ANNA L. SAvoIE, 'NORMAN A. STREET. 

